Rock drill



E. G. GARTIN ROCK DRILL sept. 2o, 193s.

Filed March 6, 1934 Patented Sept. 20, 1938 PAT-ENT oFF-ICE- ROCK DRILL Elmer-G.-Gartin,- Claremont-N. H., assigner-.to v Sullivan Machinery Company,a .corporation ,oft YMassachusetts.,-

Application` MarchG, 21934;-Serial No. 714,314

6 Claims.

This invention relates to rock drilling-mechanisms, and more particularly relates-toI improvements inv the feedingmechanismfof` a rock-drill of the vmounted drifter type;

Objectis to provide an improved feeding; mechanism fora rockdrillof themounted drifter type.

Another .object is to. providetan'improved` pneu- 'matic feedingmechanism; having. improved trans-V mission .connections l betweenthe-.feeding motor and the drill `-to loe-fed.,` Stillianother object-fis to. provide an improvedtransmission'.Imeansazbetween the'lfeeding motorland. thedrill torbefed -'an-d including. flexible transmission yelements and improvedfeeding 'connectionsl actuatedl by said transmission elements; the-motor havingr .-in'corporated .therein fimproved `iluldA sealing means',- wh'ereby leakage -ofvthe 4pressure -uidfrom: the-- ,i motor. is iy 1reduced toxa minimum.: Yetanother. object istoi providean impro-ved speed multiplying mechanismA between the; feeding -motor andv thedrill; whereby the drill ls-'fedv atla rate faster-1- than the rate of-movementfof--thefpower feeding- These--and--otherr lobjects of -the'- -invention` will,` however, hereinaften-moref fullyappear.

' element.

In the accompanying .drawing there--isshown, for purposes ofillustration; one form which the invention may-assume inf-practice In the-drawing--n Fig; 1 iisl a central, longitudinally extending;

vertical.A sectional View; f-with partsv v-inelevation;- showinfg -the `illustrative embodiment of `the-im-` proved rock. drilling mechanism.

mechanism-l shown in Fig. fl.

positions -of the feed controlling valve;-

mechanism :disclosed 1 herein generally comprises arock drill,A generally designated I, off; 'a usual pressure Tfluid .actuated f hammer ftypaf mountedfor 2 nlongitudinal :i movement onv :a guidei shell :"2 i.; and. having. improved pneumaticfeeding. means,

generally' designatedv 3.-

'The improved 'feeding 'mechanism-:comprises alinedifcylinders 4` and 5 having .at their'. remote' L iends fhe'ad membersf- 6 fand- .1 and. arranged :be-

An object ofzthis invention -istoiprovide an im-I provedA rockrzdrill feedingamechanismf. A further.;

Fig-Z is; a rear end elevational view, Xwith parts shown in ver-tical-v section, of the improved drilling vFigir lf-is -a--diagrammatic :view 2show-ingfftwo tween their adjacent ends a common head member-or 'partition-81 This-intermediate heador partition is herein formed integral with the feed' cylinders, althoughit will be .evident that the feedcylinders may be formed as separate elements to which the intermediate head is secured, and the-heads 6 and 'I are suitably detachably secured-to thel cylinder. Formed on the bottom off'the guide shell adjacent the intermediate.- head-.is a swivel `plate 9 adapted to be clamped in the-usual saddle mounting kof a quarry bar or tripodsupport. Reciprocably mounted in the feed cylinders-4 and 5, respectively, are feed pis-. tons-Inf and II, eachv having suitable cup packing-I2 and rigidly secured together for movement. in unison with respect to the cylinders by-means of a common piston rod I3. 'I'hese pistons are eachf'secured-to the piston rod against'a collar Ill-formed on the rod by a holdingnut I5 threadedly secured-to the rod, the piston-being clamped-f by the nutagainst the collar. This piston rod ex-f tends through a central opening or bore I6 formed in' 'the intermediate head or partition 8,-and this opening is suitably packed, as by cup packings I 'l-, for preventingleakage of fluid from the-cylinders. The opposite ends of the-piston rod have-formed therein sockets I8 each for receiving -a suitable-- head--ISfsecured to a flexible transmission/ element 20', herein in the form of a wire ropeoreable,the head I9 being secured within the socket- IllI by-a bushing l2| threadedwithin-the end-of the-piston rod in the `manner shown.` The exible-transmission elements 20, 20 extend in -opposite directions outwardly through the remote ends'of the cylinders through openings 22 formed in --the heads 6 and 'l and pass around gui-desheaves 23 and 24, respectively, herein suitablyjournaledon'shafts v2II carried by the heads 6 and 7.- These flexible elements extend inwardly from the guide sheaves toward one another in a relation parallel with the feed cylinders, and. are provided -with `heads 25 positioned within sockets 26=-formed in a sliding block 21. The guide shell 2-is provided, as shown most clearlyl in Fig,.2, longitudinal guideways 28, 28, and therock drill I-is provided with longitudinal guides 2931.29 slidably arranged within these guideways, Also slidably guided Within the guldeways 28'is the slid-` ing block vrZ'l, the latter being arrangedy within the guideways in the space between the guide' bottom and kthe bottom of the rock drill, as shown in Fig. 2. Arranged in a chamber 30 formed in the sliding block 2T and journaled on a shaft 3l supported `at its ends-within the` sidesof the slid-z, ing. block, is a vspur pinion 32 :meshing with .a'

relatively stationary rack 33 formed integral with cylinders to effect reoiprocation of the feed pistons, it will be noted that formed in the intermediate head 8 is a bore 36 in which is mounted a rotary valve 31, and this valve has a suitable control handle 38. Ihe valve 31 is provided with a bore 39 to which pressure fluid is supplied through a flexible hose connection 4l)v connected by a T 4I to the usual uid supply connection 42 of the rock drill, the connection 42 leading toY any suitable source of pressure fluid supply.A Connecting the valve receiving bore 36 with the interior of the feed cylinders 4 and 5 are fluid supply passages 44 and 45, while also communicablewith 251 the valve receiving bore is a vent passage 45 leading to atmosphere. Formed externally on the valve31 are circumferentially extending grooves 41 and 48, the former connected to the bore 39 in the valve vthrough a passage 49. 1305i controlr valve 31 is in the position a lin Fig.V 4, pressurefluid is supplied from the bore 39 ofthe valve through passage 49, groove 41 and the forward-feedpassage 44 to the forward end of the rear feed cylinder 4 to act on the forward pres- .,'35'5 sure area of the rear feed piston I9, thereby moving the piston rod I3 rearwardly, and through the f flexible connections moving the sliding block 21 Y forwardly, causing the gear 32-to rotate; and as a result the rock drill I is fed forwardly at an increased rate along the guideways of the guide shell, the-rear end of the front feed cylinder 5 at the rear side of the feed piston I I at that time being connected to atmosphere through the passage 45, groove 48 and vent passage 46. When f the feed control valve is turned into the position b inFig. 4, pressure fluid is supplied from the bore 39'in the valve through passage 49, groove 41 and the reverse-feed passage 45 to the rear end of the front feed cylinder 5, the pressure fluid' acting on 50 ,the rear pressure area of the front feed piston II, moving the latter and the piston rod forwardly,

thereby drawing in the rear feed cable 29 and,

through the speed multiplying connections, feeding the rock drill rearwardly along the guide ;;shell, the forward end of the rear feed cylinder 4 at that time being connected to exhaust through passage 44, groove 48 and vent passage 48. The remote ends of the feed cylinders 4 and 5 at the front and rear sides of the feed pistons Il] and I I, respectively, are vented to atmosphere through the openings 22 in the heads 6 and 'l through which the flexible transmission elements 29 eX- tend. By arranging the feed pistons so that pressure fluid acts only on the inner pressure areas thereof, and connecting the cables to the outer sides of the pistons, and by sealing the piston rod connection between the pistons, fluid leakage from the cylinder is reduced to a mini- Y mum while retaining the advantageous features of 70,.the.flexible connections. Y

yAs a result of this invention, it will be noted that an improved pneumatic feeding mechanism for av rock drill of the mounted drifter type is provided, the improved feeding mechanism hav- 'Ii/.ing'associated therewith improved transmission,

When the connections between the power feeding element and the drill to be fed. It will further be noted that an improved feeding mechanism is provided of the multi-cylinder and piston type having improved connectionsrbetween the pistons and the and thatthe invention may be modified and embodied in various other forms without departing Hfrom'itsspirit-or th'e scope of the appended claims.. f

What I claim as new rand desire to secure by Letters Patent is:

l; In a rock drilling mechanism, the combination with a rock drill and guiding means therefor, of a feeding mechanism for feeding the rock drill in eitherI of opposite directions along said guiding means including alined feed cylinders arranged alongside and parallel with said guiding' means, feed pistons individual to and reciprocable in, said feed cylinders respectively, meansV for connecting said pistons for movement in unison, av speed multiplying means common to both directions 4of movement ofv the drill and operatively connected tothe drill for feeding the latter along said guiding meansat a speed faster than the rate of movement of saidfeed pistons and including an element movable alongside said feed cylindersin adirection parallel with said guiding means, a flexible transmission connection betweenv onefeed piston and said element of said speed multiplying meansa separate flexible transmission connection between said other feedpiston and Y said element of said speed multiplying means, and means for vsupplying pressure fluid selectively to-said feed cylinders to act on one sheaves journaledv on said brackets respectively,

a speed multiplying means common to both feeding movements of the drill and operatively connectedto the rock drill, movement of the rock drill in opposite directions being effected through said speed multiplying means, flexible transmission elements between the opposite ends-of the piston rod and said speed multiplying means and guided-by said sheaves, and means for supplying pressure fluid vselectively to the adjacent ends of said feed cylinders to act on one or the other of said feedpistons. y

3. -In Va `rock drilling mechanism, in combination, a rock drill, and feeding mechanism for the rock drill comprising alined. feedv cylinders, feed pistons, reciprocable in said cylinders respectively, a common piston rod'y connecting said feed pistons together for movement in'unison, a sliding block, `fiexible connections* betweeny the opposite ends .of saidl pistonrrod and said sliding block, a rack on the, rock drill, a rack secured against Got movement longitudinally with respect to said feed cylinders and arranged alongside of the latter, a gear carried by said sliding block and meshing with said racks, and means for supplying pressure fluid selectively to the adjacentl ends of said feed cylinders to act on one or the other of said pistons to effect drill feed in either of opposite directions.

4. In a rock drilling mechanism, in combination, a rock drill, guiding means providing a longitudinal guideway on which the drill is guided for movement longitudinally of the guiding means, and means for feeding the rock drill along said guideway comprising a pneumatic feeding motor mounted on said guiding means and arranged in parallel side by siderelation with said guideway, said feeding motor comprising a feed cylinder member, a feed piston reciprocable therein, a sliding block, a cable connecting said feed piston to said sliding block, a gear carried by said sliding block, a relatively stationary rack with which said gear meshes, said rack extending longitudinally of said feeding motor in parallelism with said guideway and between the ends thereof, and a rack secured to the rock drill and with which said gear meshes.

5. In a rock drilling mechanism, a guideway, a pair of alined cylinders having an intermediate common cylinder head and extending parallel to said guideway and arranged With said head between and spaced substantially from the opposite en-ds of said guideway, pistons in said cylinders having a piston rod connecting them and passing through said common head, a drilling motor movable on said guideway, means including speed multiplying mechanism for operatively connecting the relatively remote ends of the pistons to feed said -drilling motor, said speed multiplying means including cooperating speed multiplying elements and a block carrying an element of said speed multiplying means and moving between the relatively remote ends of the cylin-ders and connected at its opposite ends respectively to different pistons, and means for supplying pressure fluid selectively to said feed cylinders to act on one or the other of said feed pistons to effect drill feed in either of opposite directions.

6. In a rock drilling mechanism, in combination, a rockY drill, an-d means for feeding the drill including a pneumatic feeding motor comprising alined cylinders each containing a reciprocable piston, and a common piston rod for connecting said pistons for movement in unison, means for selectively supplying pressure uid to the adjacent ends of said cylinders to act on one piston or the other to effect movement of the piston rod in one direction or the other, a speed multiplying means operatively connected to the drill and including a movable element, and connections between the opposite ends of the piston rod and said element of said speed multiplying means for moving said element in opposite directions at the same speed as the rate of movement of said piston rod, said speed multiplying means comprising elements cooperating with said movable element for multiplying the speed between said movable element and the rock drill whereby the drill is fed at a multiplied rate of speed.

ELMER G. GARTIN. 

